[JRSully]

Tom, Allen is correct if it is for a 69 or 70 BB Nova, I THINK a clutched fan came on the 68 BB Nova cars. Chevy found out quickly that it wasn't cooling the high heat BB motor and switched to a no clutch 5 bladed piece for 69 and 70. The fan is unique to the Nova, it has 2 blades together and 3 spread apart and is 17" diameter. They are very rare, most were chucked early because they made a lot of noise. A dented up one sold on EBay immediately for $510.00 just recently. Call Wayne Bushey at NNN, he may have an extra, but get your wallet open. The only marks I have seen on the fans are either a "W" ot "TW" on the rear of a blade bracket, there are 2 different bolt pattern as well, the service replacement has 2 sets of bolt/mounting holes and an original assembly line fan has only one set of mounting holes, blades are the same on all. Good luck